Gnathotheca: Bird Term of the Day

Definitions of words used by pet bird enthusiasts with the pet bird slant.

Courtesy Elaine Girardi, MarylandThe covering of a bird's lower beak is called the gnathotheca.

gnathotheca: (noun) The covering of the lower beak, which is a keratin surface. Keratin is the tough and fibrous protein substance that forms the outer layer of epidermal structures, such as horns and nails.

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